MIC2298_11 Datasheet, PDF (3/13 Pages) Micrel Semiconductor – 3.5A Minimum, 1MHz Boost High Brightness White LED Driver

Micrel, Inc.
MIC2298
Absolute Maximum Ratings⁽¹⁾
Supply Voltage (V_IN) .......................................................12V
Switch Voltage (V_SW)....................................... –0.3V to 34V
BRT Voltage (V_BRT) ........................................... –0.3V to 6V
SS/DIM Voltage (V_SS)........................................ –0.3V to 6V
Enable Voltage (V_EN)....................................... –0.3V to 12V
FB Voltage (V_FB)...............................................................6V
Switch Current (I_SW) .........................................................6A
Ambient Storage Temperature (T_s) ...........–65°C to +150°C
ESD Rating⁽³⁾.................................................................. 2kV
Operating Ratings⁽²⁾
Supply Voltage (V_IN).......................................... 2.5V to 10V
BRT Voltage (V_BRT) ........................................... 0V to 0.6V_IN
Enable Voltage (V_EN).............................................. 0V to V_IN
Output Voltage (V_OUT) ................................... V_IN + 1 to V_OVP
Junction Temperature (T_J) ........................ –40°C to +125°C
Package Thermal Impedance
3x3 MLF-12 (θ_JA) ...............................................60°C/W
Electrical Characteristics⁽⁴⁾
T_A = 25°C; V_IN = V_EN = 3.6V; V_OUT = 7V; I_OUT = 1A, unless otherwise noted. Bold values indicate –40°C< T_J < +125°C.
Symbol Parameter
Condition
Min Typ Max Units
V_IN
Supply Voltage Range
2.5
10
V
V_UVLO
Under-Voltage Lockout
1.8
2.1
2.4
V
V_OVP
Over-Voltage Protection
12 13.5
15
V
I_VIN
Quiescent Current
V_FB >200mV, Not Switching
15
23
mA
I_SD
Shutdown Current
V_EN = 0V (Note 5)
0.1
1
µA
V_FB
Feedback Voltage
(+/-8%)
(+/-10%) (Over Temp)
184 200
216
180
220
mV
I_FB
Feedback Input Current
Line Regulation
I_LED
BRT accuracy (Note 6)
V_FB = 200mV
2.5V ≤ V_IN ≤ 4.5V
R_BRT = GND
R_BRT = 50K
-650
nA
0.5
%
17
20
23
45
50
55
%
D_MAX
Maximum Duty Cycle
85
90
%
I_SW
Switch Current Limit
V_SW
Switch Saturation Voltage
I_SW
Switch Leakage Current
V_EN
Enable Threshold
V_IN = 3V
V_IN = 3.6V, I_SW = 3.5 A
V_EN = 0V, V_SW = 15V
TURN ON
TURN OFF
3.5 4.75
8
A
350
500
mV
0.01
10
µA
1.5
0.4
V
I_EN
Enable Pin Current
f_SW
Oscillator Frequency
I_SS
Soft start / DIM current
V_EN = 10V
DIM = 0V
T_J
Over-Temperature Threshold
Shutdown
Hysteresis
20
40
µA
0.8
1
1.2
MHz
5
µA
150
°C
10
°C
Notes:
1. Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating
the device outside of its operating ratings. The maximum allowable power dissipation is a function of the maximum junction temperature, T_J(Max), the
junction-to-ambient thermal resistance, θ _JA, and the ambient temperature, T_A. The maximum allowable power dissipation will result in excessive die
temperature, and the regulator will go into thermal shutdown.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. Specification for packaged product only.
5. I_SD = I_VIN
6. As percentage of full brightness where V_IN = V_BRT = 3.6V (100% brightness)
October 2007
3
M9999-101707-B